Browse the GRAIN theme library. Returns predefined themes with names, descriptions, keywords, and categories.
AI agents call list_themes to retrieve information from Sablier MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool purely queries and retrieves metadata about predefined themes from a library. It performs a passive read operation without creating, modifying, deleting, or executing any external operations. The blast radius of misuse is minimal—an agent could only enumerate available themes, which is informational data with no destructive or financial impact.
From the tool's definition Tool name is 'list_themes' and description states it 'Browse[s] the GRAIN theme library. Returns predefined themes with names, descriptions, keywords, and categories.' The verb 'Browse' and 'Returns' indicate data retrieval with no modifications, deletions,…
Attacks that exploit this kind of access
Browse the GRAIN theme library. Returns predefined themes with names, descriptions, keywords, and categories. It is categorised as a Read tool in the Sablier MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Sablier MCP Server MCP server in PolicyLayer and add a rule for list_themes: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Sablier MCP Server. Nothing to install.
list_themes is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_themes rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list_themes. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list_themes is provided by the Sablier MCP Server MCP server (sablier-ai/sablier-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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